<!DOCTYPE html>
<html lang="en" class="reftest-wait">
<meta charset="utf-8">
<title>Moving the transform under the absolutely-positioned layer should cause that to invalidate</title>

<style>

.content {
  box-sizing: border-box;
  width: 200px;
  height: 200px;
  border: 1px solid black;
}

.absolute {
  position: absolute;
  z-index: 2;
  top: 20px;
  left: 240px;
}

.reftest-no-paint {
  border-color: lime;
}

.transform {
  will-change: transform;
}

body {
  margin: 0;
  padding: 20px;
  height: 3000px;
}

</style>

<div class="transform content" id="aboutToMoveUnderAbsolute">
  <!--
    This transform is active + prerendered, and will move under the
    absolutely-positioned item.
  -->
</div>

<div class="absolute reftest-no-paint content">
  <!--
    This absolutely-positioned element should get its own PaintedLayer above the
    transform.

    It shouldn't attempt to pull up an opaque background color from the page,
    because the transform can move under it.
  -->
</div>

<script>

function doTest() {
  document.querySelector("#aboutToMoveUnderAbsolute").style.transform = "translateX(100px)";
  document.documentElement.removeAttribute("class");
}
document.addEventListener("MozReftestInvalidate", doTest, false);

</script>
